Logo image
Back
Co@CoO@Au core-multi-shell nanocrystals
Journal article   Peer reviewed

Co@CoO@Au core-multi-shell nanocrystals

Stephanie H Johnson, Craig L Johnson, Steven J May, Samuel Hirsch, M. W Cole and Jonathan E Spanier
Journal of Materials Chemistry, v 2(3), pp 439-443
22 Dec 2009
DOI: https://doi.org/10.1039/b919610b
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

We report on the chemical synthesis, structural and compositional characterization, and hierarchical organization of Co-core, concentric CoO-Au multi-shell nanocrystals (Co@CoO@Au). Based on electron microscopy, magnetometry and spectroscopy experiments, we present compelling evidence for the formation of the Au outer shell on CoO, challenging the common assumption that the reduction reaction to form Au shells can only occur if the cobalt surface has not oxidized. Our findings suggest that the presence of a metal shell surrounding a transition-metal core nanocrystal following such a reduction reaction cannot be taken as evidence that the transition metal oxide is absent from the surface of the nanocrystal core. We find that Au shell growth can produce Co@CoO@Au nanocrystals possessing five-fold twinning symmetry and we suggest that their growth is facilitated through self nucleation and coalescence of Au particles. The structure and property characterization of Co-core, Au shell nanocrystals indicate the presence of an interfacial oxide and twinning of Au shells, evidence for self-nucleation and coalescence of Au nanoclusters.

Metrics

6 Record Views
24 citations in Web of Science
33 citations in Scopus

Details

UN Sustainable Development Goals (SDGs)

This publication has contributed to the advancement of the following goals:

#3 Good Health and Well-Being

InCites Highlights

Data related to this publication, from InCites Benchmarking & Analytics tool:

Collaboration types
Domestic collaboration
Web of Science research areas
Chemistry, Physical
Materials Science, Multidisciplinary
Logo image